This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: INA180
I would like to use an INA180 in low side configuration to measure the charge current of a battery (shunt lives on the negative terminal of the battery). However, there are situations where the battery will be discharging. I don't care about measuring the discharge current in this situation but I want to make sure I will not damage the INA180 device or cause extra unwanted current draw in this situation where IN+ has a lower voltage than IN-.
At full scale discharge, IN+ would have the lowest voltage of the system - but it would be well above the -0.2V Minimum common mode input voltage spec.
Is the INA180 device okay in this condition? I would expect it to output the lowest voltage it can output (close to the 0V rail) but not damage the device.
As long as the minimum input common-mode voltage of -0.2V is being met, the INA180 will be fine. If the differential input voltage is negative, the input stage will be cutoff and the output stage will output the lowest possible voltage, roughly 20mV above GND. This will not damage the part.
If Vcm goes below -0.3V, you risk turning on the input ESD cells and conducting high currents through the device, which could lead to damage. If that is a possibility, then I advice using external protection components or adjusting your design.
Ian WilliamsApplications ManagerCurrent & Magnetic Sensing
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.